וּבְבֹאָ֑הּ הִנֵּ֣ה בָאָ֔ה וְיָ֣דְע֔וּ כִּ֥י נָבִ֖יא הָיָ֥ה בְתוֹכָֽם׃ (ס)
At kapag ito ay dumating — narito, ito ay dumarating na — malalaman nila na may isang propeta sa gitna nila.
Rashi
behold it is coming for, indeed, it is ready to come; then they will know that your words were not a jest, but that a true prophet was in their midst.